Excellent Water Quality
| Compound | Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| PFOS | 13.0 ppt | 4 ppt | 4 ppt | Exceeded |
| PFBA | 8.6 ppt | No standard | 500 ppt | Unregulated |
| PFOA | 6.3 ppt | 4 ppt | 4 ppt | Exceeded |
| PFPeA | 4.0 ppt | No standard | — | Unregulated |
| PFBS | 3.9 ppt | 2000 ppt | 100 ppt | Below limit |
| PFHxA | 3.0 ppt | No standard | 400 ppt | Unregulated |
Water Quality Summary
Tap water quality in Whittier, California (90603) receives an overall grade of A (Excellent) with a score of 88 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is 7 points above the California state average of 81. Compared to the national average (75), this area performs significantly better. The area is served by 2 water systems providing water to approximately 66,045 people, using groundwater sources. Notably, 2 PFAS compounds exceed EPA limits — a significant concern given the persistent nature of these chemicals. The area has a clean violation record over the past 5 years — a positive indicator of consistent water quality management.
A score of 88/100 means the water supply in Whittier, CA meets or exceeds all EPA standards with minimal issues. Contaminant levels are well within safe limits, and the water system has maintained a strong compliance record. While no water supply is guaranteed perfect at the tap due to household plumbing, this is among the best-scoring areas in the country.
Common Questions
Based on EPA data, tap water in Whittier, California receives a grade of A (Excellent) with a score of 88/100. This indicates the water meets federal standards and has relatively few concerns. However, individual homes may still have localized issues such as lead from old plumbing.
ZIP code 90603 is served by 2 water systems using groundwater sources, providing water to approximately 66,045 people. Groundwater is naturally filtered through rock and soil, often requiring less treatment. However, it can be vulnerable to contamination from underground sources like naturally occurring arsenic, nitrates from agriculture, or PFAS from industrial sites.
No lead data is currently available for ZIP code 90603. This may mean lead testing results haven't been reported recently, or the serving water system uses monitoring waivers. You can request a free lead test kit from most water utilities or purchase a certified home testing kit.
Yes — 6 PFAS compounds were detected in water serving Whittier, California, and 2 exceed EPA maximum contaminant levels. PFAS are persistent chemicals linked to cancer, immune system effects, and developmental issues. A reverse osmosis or activated carbon filter certified for PFAS removal is recommended.
Water systems serving Whittier, California have zero violations in the last 5 years. This is a positive indicator of consistent regulatory compliance and water quality management.
Based on detected contaminants (PFAS), residents in Whittier, California should consider: Reverse osmosis (RO) system — most effective for PFAS, lead, and other contaminants. Always look for filters with NSF/ANSI certification for the specific contaminants you want to remove.
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